The 'performance-metrics' type is an instance-identifier and should point to operational (read-only) data store.  For proper data-store management the require-instance false flag is needed.  (reported by alex.stancu)

In addition: 

• Due the to change a new revision is required.
• The 'job-tag' must not be a string of a fixed size
• The string pattern with '^' and '$' is not required and leads to issues in some NETCONF frameworks.